app.use(session({
//处理错误express-session deprecated undefined resave option; provide resave option app.js
resave: false,//添加这行
saveUninitialized: true,//添加这行
secret: settings.cookieSecret,
key: settings.db,//cookie name
cookie: {maxAge: 1000 * 60 * 60 * 24 * 30},//30 days
store: new MongoStore({
url: 'mongodb://' + settings.host + '/' + settings.db
//db: settings.db,
//host: settings.host,
//port: settings.port
})
}));